After building the kernel and restarting I had no problems and no warnings
with error handling. Even burning of CDs worked with the new driver
(qlogicisp crashed always the whole machine with a kernel panic). And it
seems to better support the UW features of the isp card (dd if=/dev/sda
of=/dev/null was faster than we qlogicisp driver.

To get this running do the following:
* Get patch from ftp://alpha.thetaphi.de/kernel/
* Patch your 2.6.8 kernel source
* run make menuconfig and disable the qlogicisp driver completely and
enable the support for isp1020/1040 in qla1280 (new item there)
* generate kernel image
* change /usr/sbin/mkinitrd by replacing all occurences of qlogicisp with
qla1280 -- in case of making qla1280 the default in newer debian kernels
there must be some checking of the kernel version here to generate a
correct initrd.img after updating from older kernels!!!
* install it, mkinitrd should generate no failures
* reboot

The kernel image in ftp://alpha.thetaphi.de/kernel/ is the default debian
kernel build with this patches -- but for architecture "alcor" not
"generic". If someone have a Alphastation 500 he can test the debian
binary. Others have to build a new kernel module.